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April 18, 2006

Windows Live Messenger可以自由申请

作者:eygle

出处:http://blog.eygle.com

在微软的Live主页上,现在Windows Live Messenger Beta版现在可以自由申请了.

只要拥有一个MS的Passport就可以申请下载来使用了.

尝试试用版吧,现在我使用Live Messenger感觉很好,唯一不太方便的就是,很多使用MSN7.5或MSN7.0的朋友在我的MSN上始终是显示脱机的.对方可以看到我,我却无法看到对方连线.

还没有用到Live Messenger的朋友可以试试看了.

Posted by eygle at 5:02 PM | Comments (7)

dbv能用来检查日志文件么?

作者:eygle

出处:http://blog.eygle.com

Oracle提供命令行工具DBV用来检查数据文件的完好性.

那么DBV可以用来检查日志文件么?

答案是不能.

Oracle在文档中这样描述DBV工具:

DBVERIFY is an external command-line utility that performs a physical data structure integrity check. It can be used on offline or online databases, as well on backup files.

DBVERIFY checks are limited to cache-managed blocks (that is, data blocks). Because DBVERIFY is only for use with datafiles, it will not work against control files or redo logs.

再次注意到读文档是有好处的,以前并不知道DBV可以直接用来针对数据段进行检查,引用一个文档中的例子:

这是命令格式:

假定hr用户具有sysdba权限,执行:

输出如下:

DBVERIFY - Verification starting : SEGMENT_ID = 1.2.67
            DBVERIFY - Verification complete
            Total Pages Examined         : 8
            Total Pages Processed (Data) : 0
            Total Pages Failing   (Data) : 0
            Total Pages Processed (Index): 1
            Total Pages Failing   (Index): 0
            Total Pages Processed (Other): 2
            Total Pages Processed (Seg)  : 1
            Total Pages Failing   (Seg)  : 0
            Total Pages Empty            : 4
            Total Pages Marked Corrupt   : 0
            Total Pages Influx           : 0
            Highest block SCN            : 7358 (0.7358)

Oracle官方文档地址:

http://download-west.oracle.com/docs/cd/B19306_01/server.102/b14215/dbverify.htm

存此备忘.

Posted by eygle at 5:01 PM | Comments (3)